Abstract
Although the technology exists for exchanging radio messages with extraterrestrial civilizations, a successful search for such civilizations among the many stars that might support them could take more than a thousand years, even if most habitable planets are occupied by communicative civilizations.
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WALKER, J. The Search for Signals from Extraterrestrial Civilizations. Nature 241, 379–381 (1973). https://doi.org/10.1038/241379a0
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DOI: https://doi.org/10.1038/241379a0
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